Prompt photons with associated jets in photoproduction at HERA
S. Chekanov (for the ZEUS Collaboration)
TL;DR
This study measures prompt photon and jet production in ep scattering at HERA, revealing that certain QCD models underestimate cross sections at low photon energies, while kT-factorisation aligns well with data.
Contribution
It provides the first detailed comparison of prompt photon plus jet production with various QCD models in the photoproduction regime at HERA.
Findings
NLO QCD underestimates cross sections below 7 GeV.
kT-factorisation QCD agrees with data at low photon energies.
Leading-logarithm Monte Carlo models also underestimate the measurements.
Abstract
Prompt photons, together with an accompanying jet, have been studied in the photoproduction regime of ep scattering with the ZEUS detector at HERA. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD underestimate the gamma+jet cross sections for transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data in this region.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions